MerCruiser 75521 Crankcase Timing Cover Assembly 165hp 4.1L 250 Late 70's-1981 50hp The shape of your case

The shape of your case should look just like this

3L applications)

Trim Indicator Sender Assembly: 48170A 4

This is for Remote control outboards

MerCruiser 75521 Crankcase Timing Cover Assembly 165hp 4.1L 250 Late 70's-1981 50hp The shape of your casePart Number(s) Included MerCruiser 75521 Crankcase Timing Cover General Application Compatibility This was just found on MerCruiser Inline 6 4. 1L 165hp applications Serial number 4331787 & up (which would be the late 70's thru 1981) Identifiable by the location of the Timing Check Gauge Other Details Freshwater Used Parts Overall good condition (see pictures) Purchase with confidence!